Formic acid oxidation on Pd/RuO2: does the RuO2 support enhance the electrocatalytic activity of Pd nanoparticles?

• Autor(a) principal: Alvarenga, Gabriel M. [UNESP]
• Data de Publicação: 2023
• Outros Autores: Palombarini, Julio [UNESP], Gonçalves, Rosana A. [UNESP], Berengue, Olivia M. [UNESP], Nunes, Ronaldo S. [UNESP], Santos, Sydney F., Villullas, Hebe M. [UNESP], Ciapina, Eduardo G. [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1007/s10008-023-05524-8; http://hdl.handle.net/11449/247422
• topic: Formic acid oxidation; Oxide support; Palladium nanoparticles; Ruthenium dioxide

The aim of this work was to study the effect of a RuO2 support on the activity of Pd nanoparticles for formic acid oxidation, comparing the results with those obtained for Pd/C. In contrast with reports of enhancing effects of RuO2 for other systems, such as methanol oxidation on Pt particles, our data reveal a detrimental effect of the RuO2 support on the activity of Pd nanoparticles for the oxidation of formic acid. FTIR spectra show CO2 formation at potentials as low as 0.10 V and absence of adsorbed CO signals, suggesting that a bifunctional mechanism involving OH species on the oxide support surface does not occur nor has a significant contribution and that formic acid oxidation on Pd/RuO2 and Pd/C takes place by the direct pathway. The unfavorable effect of the RuO2 support on activity seems likely to be due to metal-support interactions that modify the Pd electronic properties. Graphical abstract: [Figure not available: see fulltext.]